Pearson-Arastradero Preserve in Palo Alto 
The Pearson-Arastradero Preserve is a 622-acre open space preserve in the Palo Alto foothills. Grassroots Ecology, a local environmental nonprofit collaborates with the City of Palo Alto to act as stewards of the preserve. Volunteers together with Grassroots Ecology staff restore habitat, install native plants, remove invasive species, and otherwise work together to increase biodiversity on the Preserve.